SUMMARY: De-fragmentation UFS File systems

From: Foix, Michel (
Date: Wed Nov 13 1996 - 14:30:44 CST

Hello Sun-Manager,

I agree with Brett, I never seen a fragmentation on disks get above 5%
the machines running Solaris 1.x or 2.x.

Thanks to Brett Lymn

The berkeley FFS, which is what UFS really is, is designed to
automatically defragment itself with use. You should not see any
significant fragmentation with normal usage patterns. You can check
the fragmentation by doing a "fsck -n" on the partitions. I have
rarely seen fragmentation on disks get above 5% on the machines I run.

Brett Lymn, Computer Systems Administrator, AWA Defence Industries

Thanks to mshon@East.Sun.Com

THe fragmentation reported by fsck is probably not what you think,
and will probably never get gigh enough to consider defragging.

However, UFS filesystems DO get fragmented, and there's no tool
supplied with Solaris to defrag except to ufsdump/ufsrestore.

Fortunately, there IS a commercial tool to do it.
for info and analysis part of DiskPak

Thanks also to

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